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Factory Mast Cylinder Head Factory Mast LS1 - Cathedral - Gen III & IV Cylinder Heads
$ 995.00

Factory Mast LS1 - Cathedral - Gen III & IV Cylinder Heads


Only left in stock

LS Cathedral Porting Service

241/853/243/799/317 Cylinder Heads

Priced Per Pair of Heads

Factory Mast ported GM cathedral porting service is a great option for those looking for great bang for your buck.  Legendary cylinder head guru Darin Morgan has spent countless hours perfecting ports.  These ports are now available to you in our Factory Mast cylinder heads.

Specifications: GM Stock LS Cathedral

  • Stock Chamber
  • Seats: Stock Iron
  • Guides: Stock Powdered Metal
  • Minimum Bore: 3.890"

All Factory Mast Heads get:

  • Teardown | Clean | Inspect
  • 5-Axis CNC Porting
  • Precision CNC Valve Job
  • Recondition/clean all gasket surfaces and ends
  • Hand Blending
  • Surfacing
  • Final Wash and Assembly
  • Pressure Tested

Click Here For Flow Numbers and Additional Info